Fictitious Extra Dimensions

Details Fictitious Extra Dimensions Fictitious Extra Dimensions

2005-09-08

arxiv.org/abs/hep-th/0509054v1

Physics

High Energy Physics

High Energy Physics - Theory

9 pages. Standard Latex & ws-procs9x6. typos corrected. to appear in the proceedings of the fourth International Conference on

Scientific paper

String theory requires additional degrees of freedom to maintain world-sheet reparameterisation invariance at the quantum level. These are often interpreted as extra dimensions, beyond the 4 space-time. I discuss a class of quasi-realistic string models in which all the untwisted geometrical moduli are projected out by GSO projections. In these models the extra dimensions are fictitious, and do not correspond to physical dimensions in a low energy effective field theory. This raises the possibility that extra dimensions are fictitious in phenomenologically viable string vacua. I propose that self-duality in the gravitational quantum phase-space provides the criteria for the string vacuum selection.

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